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I only use Moly oil for my M, Redline to me is a cheap brand. German oil for German which makes the most sense. In terms of oil type, 10w60 is the best and the only oil being used for S65. Sure you can run 4w50 or watever cheap oil, but the life of ur S65 will be shorter than those who use the right one. Moe, I suggest dat you use the Castrol one for now since you are still under warranty, cuz if anything happen to ur motor, Calgary BMW will blame on the Moly oil that you used for your engine.
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